nav.navbar.navbar-dark.navbar-expand-lg
    .collapse.navbar-collapse
        if nickname
            ul.navbar-nav.mr-auto
                li.nav-item
                    a.nav-link(href="./logout") Login Out
            | Hello，#{nickname}
        else
            ul.navbar-nav.mr-auto
                li.nav-item
                    a.nav-link(href="./login") Login In
                li.nav-item
                    a.nav-link(href="./register") Register
